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Old 10th Nov 2020, 5:24 pm   #101
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,482
Default Re: I found it! A very sorry looking MK14.

Can you try testing those ICs as type 7445 instead? Should work I think, the tester should just put pullups on the outputs. Just wondering if the TS200's test algorithm / truth table for 7442 is incorrect/faulty but the one for 7445 is OK?
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